Lesson 10: Your First Swap

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Lesson 10: Your First Swap

Header

Core concept: A swap is trading one token for another on a DEX—the simplest DeFi transaction and a great way to start.

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Currency Exchange Kiosk

Remember exchanging dollars for euros at the airport? The kiosk shows a rate, you hand over dollars, you get euros.

A DEX swap is the same:

• The DEX shows the exchange rate

• You send Token A

• You receive Token B

• Transaction complete

No account needed. No waiting. Just wallet, connect, swap.

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Before Your First Swap

Infographic

Checklist:

☐ Have tokens to swap You need the token you're trading (e.g., ETH).

☐ Have native token for gas On Ethereum, you need ETH for gas fees even if swapping other tokens.

☐ Know what you want What token do you want to receive? Verify it's the correct contract address for less-common tokens.

☐ Use the right DEX Uniswap for Ethereum, Jupiter for Solana, etc.

☐ Verified the URL Bookmarked or carefully typed. Not from search ads or links.

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Step-by-Step: Making a Swap

Inline Analogy

Using a DEX like Uniswap as example:

Step 1: Navigate and Connect Go to official DEX URL. Connect your wallet.

Step 2: Select Tokens Choose "From" token (what you're selling) and "To" token (what you're buying).

Step 3: Enter Amount Type how much of the "From" token you want to swap.

Step 4: Review the Quote DEX shows:

• How much you'll receive

• Exchange rate

• Price impact

• Estimated fees

Step 5: Adjust Slippage (if needed) Slippage tolerance determines max difference from quoted price. Default (0.5-1%) is usually fine. Increase for volatile tokens.

Step 6: Click Swap Initiates the transaction request.

Step 7: Review in Wallet Your wallet shows transaction details. Verify:

• Correct tokens

• Reasonable amount

• Acceptable gas fees

Step 8: Confirm in Wallet Approve the transaction.

Step 9: Wait for Confirmation Transaction processes on blockchain. Usually seconds to minutes.

Step 10: Verify Receipt Check your wallet balances. New tokens should appear.

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Understanding Swap Costs

You pay several costs:

Gas fee: Paid to the blockchain for transaction processing. On Ethereum, can range from $5-100+ depending on congestion. On L2s or Solana, usually under $1.

Trading fee: Paid to the DEX/liquidity providers. Typically 0.1-0.3% of trade value.

Price impact: Large trades relative to pool size get worse effective prices.

Slippage: Actual price might differ slightly from quote if price moves during transaction.

For small trades, gas fees often matter more than trading fees.

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Your First Swap: Recommendations

Start small: Even $10-20 is enough to learn. Mistakes are cheaper that way.

Use common pairs: ETH/USDC, SOL/USDC. Well-established with good liquidity.

Use established DEXs: Uniswap, Jupiter, SushiSwap. Audited, battle-tested.

Check gas before confirming: If fees seem abnormally high, network might be congested. Wait or use L2.

Don't swap into unknown tokens: Stick to tokens you've researched until you're experienced.

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After Your Swap

Congratulations! You just:

• Used a smart contract

• Traded without an intermediary

• Completed a DeFi transaction

From here, the DeFi world opens up. But master the basics before advancing.

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Summary

Key Takeaways

• A swap is trading one token for another—simplest DeFi transaction

• Need tokens to trade AND native token for gas—prepare both

• Review all details before confirming: tokens, amounts, fees

• Costs include gas fees, trading fees, and potential slippage

• Start small with common pairs on established DEXs

• Your first swap is your entry point—foundation for everything else